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Re: Weld Fractures

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Robert Rollo wrote:

>
>
> scenario:
>
> C 3x4.1 (A325) flange tips welded vertically to the side of a 12" Sch
> 40 (A53B) pipe for sign blade attachment.
>
> channel is tacked in position then we are stagger stitching with 3/16
> fillets 2" @ 6".
>

What welding procedure was used?

>
> outside temp was about 35F.  weld rod was 3/16" 7018.  welder attached
> one flange all the way down as indicated.  when attaching the second
> flange (opp side), the welds are cracking away from base material
> (pipe) upon cooling. No applied loads.
>

Which weld cracked? The first weld pass or the second?

>
> Thoughts ?  Other than alternating sides as installation proceeds ?
> Are we dealing with radial exp/contraction of the pipe ?  i would have
> thought channel web would flex enough to accomodate it . . .
>
> tia